Magnesium (Mg) is the central atom of chlorophyll and has an undoubted role in the photosynthesis process of the plant.
In an optimal crop, it is important that the plant can have enough magnesium.
In case of moderate lack: 0.75 ml per 1 litre.
In case of normal lack: 1 ml per 1 litre.
In case of serious lack: 2 ml per 1 litre.